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Abstract

We have studied the optical quality of holographic notch filters
and have identified that stray illumination during the exposure stage
and substrate scatter are the limiting factors. We propose and
analyze a novel holographic recording scheme in which the substrate is
rotated during exposure. Using this method, we have produced
high-uniformity, flare-free dichromated gelatin notch filters with
optical density greater than 5 and with scatter comparable with that
from polished substrates.

References

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A filtered gelatin solution was spread over the substrates (leaving the edges dry). To prevent layers from bubbles, a special container for the gelatin solution was used, where the solution was sucked from the bottom and transported through a 2-mm-diameter Teflon tube. During this step the temperature of the substrates was 25–30 °C.

6

The temperature of the plate was decreased to 16 °C. After the gelation, the plates were moved to a temperature-controlled refrigerator (at 16 °C) where they were dried for 24–48 h. After drying, samples were kept for 24 h at room-temperature conditions before recording and processing.

Table 2

Procedure for Developing DCG Holograms

Step

Bath

Duration (min)

1

Ilford hardener solution

10

2

Ilford fixer (with hardener)

15

3

Distilled water

15

4

Water–isopropanol bath (50:50)

10

5

Water–isopropanol bath (10:90)

10

6

Pure isopropanol

10

Tables (2)

Table 1

Preparation of the Dichromated Gelatin Samples

Step

Process

1

10% gelatin was swelled in distilled water for 2 h at room temperature.

A filtered gelatin solution was spread over the substrates (leaving the edges dry). To prevent layers from bubbles, a special container for the gelatin solution was used, where the solution was sucked from the bottom and transported through a 2-mm-diameter Teflon tube. During this step the temperature of the substrates was 25–30 °C.

6

The temperature of the plate was decreased to 16 °C. After the gelation, the plates were moved to a temperature-controlled refrigerator (at 16 °C) where they were dried for 24–48 h. After drying, samples were kept for 24 h at room-temperature conditions before recording and processing.